package com.thinkit.core.base;

import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class HttpServletKit {
    public static boolean jsAjax(HttpServletRequest req){
        //判断是否为ajax请求，默认不是
        boolean isAjaxRequest = false;
        if(!StringUtils.isBlank(req.getHeader("x-requested-with")) && req.getHeader("x-requested-with").equals("XMLHttpRequest")){
            isAjaxRequest = true;
        }
        return isAjaxRequest;
    }

    public static String getIpAddress(HttpServletRequest request) {
        String ipAddress = request.getHeader("x-forwarded-for");
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){
                //根据网卡取本机配置的IP
                InetAddress inet=null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ipAddress= inet.getHostAddress();
            }
        }
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15
            if(ipAddress.indexOf(",")>0){
                ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));
            }
        }
        return ipAddress;
    }


    public static String getLocalIP() throws UnknownHostException {
        String localIP = "";
        InetAddress addr = (InetAddress) InetAddress.getLocalHost();
        localIP = addr.getHostAddress().toString();
        return localIP;
    }
}
